Terminal swing quadriceps activity is primarily what type of activation?

Terminal swing quadriceps activity is primarily what type of activation?

• A. Concentric
• B. Eccentric
• C. Passive only
• D. Isometric hip activation

Answer: (B)

In terminal swing, the leg is moving forward and the knee is moving toward full extension in preparation for heel strike. The quadriceps work to brake that knee extension, absorbing energy so the knee doesn’t slam into extension. That braking action is accomplished by an eccentric contraction—the muscle is active while lengthening as it opposes the external momentum trying to extend the knee. This controlled lengthening stabilizes the knee and sets up a safe, stable contact with the ground. Concentric activation would actively shorten to extend the knee, which is more characteristic of propulsion earlier in the cycle, not the braking phase here. Isometric or passive-only activation wouldn’t provide the dynamic control needed for smooth, safe heel contact, and hip-focused activation isn’t the primary driver for controlling knee motion in this phase.

In terminal swing, the leg is moving forward and the knee is moving toward full extension in preparation for heel strike. The quadriceps work to brake that knee extension, absorbing energy so the knee doesn’t slam into extension. That braking action is accomplished by an eccentric contraction—the muscle is active while lengthening as it opposes the external momentum trying to extend the knee. This controlled lengthening stabilizes the knee and sets up a safe, stable contact with the ground. Concentric activation would actively shorten to extend the knee, which is more characteristic of propulsion earlier in the cycle, not the braking phase here. Isometric or passive-only activation wouldn’t provide the dynamic control needed for smooth, safe heel contact, and hip-focused activation isn’t the primary driver for controlling knee motion in this phase.